data-contract-validator

When to invoke

• You receive JSON lines / JSON arrays from another system and need to ensure they meet a contract.
• You want a machine-readable report of missing fields, type mismatches, and simple rule violations.

Inputs needed

• --contract: path to a contract JSON file describing fields, requiredness, and simple constraints.
• --data: path to a JSON file (either an array of objects or JSON Lines).

Contract format (example)

• fields: object keyed by field name with:
  • type: one of string|number|integer|boolean|object|array|null
  • required: true/false
  • min_length / max_length (strings)
  • min / max (numbers)
  • regex (strings)
• rules: list of cross-field rules:
  • name
  • if: list of conditions (field, op, value)
  • then: list of requirements (field, op, value)